Low-energy-consumption management method for chimney white smoke

Abstract

A low-energy-consumption management method for chimney white smoke includes the steps that heat exchange devices are arranged in a smoke exhausting device in the direction in which the purified smoke is input and then output; and the white smoke is eliminated in the mode that the smoke is cooled firstly and then heated through the heat exchange devices. Heat dissipated when the smoke is firstly cooled serves as a heat source of the heat exchange device used for subsequently heating the smoke. Cooling energy generated when the smoke is subsequently heated serves as a cold source of the heat exchange device used for previously cooling the smoke. According to the method, the beneficial effect that a cooling tower has an extremely high energy efficiency ratio in the intermediate temperature field is fully utilized, and smoke treatment consumption is remarkably reduced. Meanwhile, an energy recycling inter-feedback system composed of the heat exchange devices is utilized, and accordingly cooling loads of the second heat exchange device are further reduced; and excessive heat energy recycled by the first heat exchange device can also be used for exhausting air of the cooling tower, reheating the cooling tower and eliminating the white smoke of the cooling tower.

Description

technical field [0001] The invention belongs to the technical fields of environmental protection and energy, and in particular relates to a method for treating chimney white smoke with low energy consumption. Background technique [0002] In systems such as wet desulfurization, the wet saturated flue gas at 50°C is usually discharged. Cooling of the chimney wall to [0003] Under the mixing and cooling effect of ambient air, the flue gas becomes supersaturated and produces white smoke. [0004] White smoke not only affects the appearance of the environment, but also contains certain harmful components. All countries in the world attach great importance to the problem of white smoke and spend a lot of money on its treatment. [0005] At present, the method to solve the white smoke of the chimney is to heat the exhausted flue gas and reduce the relative humidity, such as the GGH method or the direct heating method. [0006] Theory and practice have proved that when the ...

AI Technical Summary

Problems solved by technology

[0006] Theory and practice have proved that when the exhaust gas is heated above 100°C, the smoke can be completely eliminated, while the GGH method can only be heated to 80°C, that is, the existing GGH method cannot completely eliminate white smoke. At the same time, GGH recovers high temperature When using flue gas heat energy, it faces serious corrosion problems, and thus generates a lot of maintenance costs

The direct heating method also faces a large amount of energy costs

For example: for every 1 million cubic meters of wet desulfurization flue gas, about 200,000 tons of steam is consumed per year, and the cost of use is 20 million yuan if the steam cost is 120 yuan / ton

Images